[t-writescode]

This is the answer. Flash was at its best, in my opinion, with its low-to-no-code animation approach. Newgrounds is or was full of people creating splines-based, animated artwork in a way I haven't seen as easily and fully replicated by as many people as it was in the days of Flash.

[piva00]

I've been thinking about this sometimes, I don't understand why there hasn't been any editor suite to generate HTML5 + JS animations like Macromedia Flash did. On the foundation it's basically the same concepts: a canvas that can draw vectors and a scripting language based on ECMAScript. The editor then has a timeline control and can render the appropriate assets for animating it: vectors and scripts that animate those vectors based on the timeline information.

Is there some technical limitation I haven't figured out? Or is it simply a matter that no one has done it yet?

[yetihehe]

There is no technical limitation, it's very possible today. Commercial developers don't want to touch it because Adobe could sue them and/or it could be hard to extract enough money from such system, open-source developers apparently don't care enough to start doing it from scratch